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/*******************************************************************************
* Copyright 2016-2018 Intel Corporation
* All Rights Reserved.
*
* If this software was obtained under the Intel Simplified Software License,
* the following terms apply:
*
* The source code, information and material ("Material") contained herein is
* owned by Intel Corporation or its suppliers or licensors, and title to such
* Material remains with Intel Corporation or its suppliers or licensors. The
* Material contains proprietary information of Intel or its suppliers and
* licensors. The Material is protected by worldwide copyright laws and treaty
* provisions. No part of the Material may be used, copied, reproduced,
* modified, published, uploaded, posted, transmitted, distributed or disclosed
* in any way without Intel's prior express written permission. No license under
* any patent, copyright or other intellectual property rights in the Material
* is granted to or conferred upon you, either expressly, by implication,
* inducement, estoppel or otherwise. Any license under such intellectual
* property rights must be express and approved by Intel in writing.
*
* Unless otherwise agreed by Intel in writing, you may not remove or alter this
* notice or any other notice embedded in Materials by Intel or Intel's
* suppliers or licensors in any way.
*
*
* If this software was obtained under the Apache License, Version 2.0 (the
* "License"), the following terms apply:
*
* You may not use this file except in compliance with the License. You may
* obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
/*
// Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//
// Context:
// ippsGFpECTstKeyPair()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpgfpecstuff.h"
/*F*
// Name: ippsGFpECTstKeyPair
//
// Purpose: Test Key Pair
//
// Returns: Reason:
// ippStsNullPtrErr NULL == pEC
// NULL == pPrivate
// NULL == pPublic
// NULL == pResult
// NULL == pScratchBuffer
//
// ippStsContextMatchErr illegal pEC->idCtx
// pEC->subgroup == NULL
// illegal pPrivate->idCtx
// illegal pPublic->idCtx
//
// ippStsRangeErr ECP_POINT_FELEN(pPublic)<GFP_FELEN()
//
// ippStsNoErr no errors
//
// Parameters:
// pPrivate pointer to the private key
// pPublic pointer to the public key
// pResult pointer to the result:
// ippECValid/ippECInvalidPrivateKey/ippECPointIsAtInfinite/ippECInvalidPublicKey
// pEC pointer to the EC context
// pScratchBuffer pointer to buffer (1 mul_point operation)
//
*F*/
IPPFUN(IppStatus, ippsGFpECTstKeyPair, (const IppsBigNumState* pPrivate, const IppsGFpECPoint* pPublic, IppECResult* pResult,
IppsGFpECState* pEC, Ipp8u* pScratchBuffer))
{
/* EC context and buffer */
IPP_BAD_PTR2_RET(pEC, pScratchBuffer);
pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr);
/* test result */
IPP_BAD_PTR1_RET(pResult);
*pResult = ippECValid;
/* private key validation request */
if( pPrivate ) {
pPrivate = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrivate, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pPrivate), ippStsContextMatchErr);
{
BNU_CHUNK_T* pS = BN_NUMBER(pPrivate);
int nsS = BN_SIZE(pPrivate);
BNU_CHUNK_T* pOrder = MOD_MODULUS(ECP_MONT_R(pEC));
int orderLen = BITS_BNU_CHUNK(ECP_ORDBITSIZE(pEC));
/* check private key */
if(cpEqu_BNU_CHUNK(pS, nsS, 0) || 0<=cpCmp_BNU(pS, nsS, pOrder, orderLen)) {
*pResult = ippECInvalidPrivateKey;
return ippStsNoErr;
}
}
}
/* public key validation request */
if( pPublic ) {
IPP_BADARG_RET( !ECP_POINT_TEST_ID(pPublic), ippStsContextMatchErr );
IPP_BADARG_RET(ECP_POINT_FELEN(pPublic)<GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsRangeErr);
{
IppsGFpECPoint T;
cpEcGFpInitPoint(&T, cpEcGFpGetPool(1, pEC),0, pEC);
do {
/* public != point_at_Infinity */
if( gfec_IsPointAtInfinity(pPublic) ) {
*pResult = ippECPointIsAtInfinite;
break;
}
/* order*public == point_at_Infinity */
gfec_MulPoint(&T, pPublic, MOD_MODULUS(ECP_MONT_R(pEC)), BITS_BNU_CHUNK(ECP_ORDBITSIZE(pEC)), /*0,*/ pEC, pScratchBuffer);
if( !gfec_IsPointAtInfinity(&T) ) {
*pResult = ippECInvalidPublicKey;
break;
}
/* addition test: private*BasePoint == public */
if(pPrivate) {
gfec_MulBasePoint(&T, BN_NUMBER(pPrivate), BN_SIZE(pPrivate), pEC, pScratchBuffer);
if(!gfec_ComparePoint(&T, pPublic, pEC))
*pResult = ippECInvalidKeyPair;
}
} while(0);
cpEcGFpReleasePool(1, pEC);
}
}
return ippStsNoErr;
}
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